Greenidge facility fire contained; operations and Bitcoin mining resume

Greenidge Generation Holdings Inc. reported that its Dresden, New York power generation facility experienced an electrical switchgear failure and fire on November 23, 2025, which triggered automated safety protocols and fully shut down the plant.

Rhea-AI Filing Summary

Greenidge Generation Holdings Inc. reported that its Dresden, New York power generation facility experienced an electrical switchgear failure and fire on November 23, 2025, which triggered automated safety protocols and fully shut down the plant. The issue was contained, with the response led by company employees along with local firefighters and utility partners.

The company stated that its owned and hosted Bitcoin miners at the site were not damaged. The facility returned to normal operations on December 9, 2025, roughly two weeks after the incident, and has resumed consistently delivering power to the local grid.

8-K Event Classification

Item 8.01 — Other Events

1 item

Item 8.01 Other Events Other

Voluntary disclosure of events the company deems important to shareholders but not covered by other items.

FAQ

What incident did Greenidge Generation Holdings Inc. (GREE) report at its Dresden facility?

Greenidge Generation Holdings Inc. reported an electrical switchgear failure and resulting fire at its Dresden, New York power generation facility on November 23, 2025, which led to a complete de-energization of the plant under automated safety protocols.

Were Greenidge Generation Holdings Inc. (GREE) Bitcoin miners damaged in the incident?

The company stated that the incident did not result in any damage to its owned or hosted Bitcoin miners located at the Dresden facility.

How long was Greenidge Generation Holdings Inc.’s Dresden facility offline after the fire?

The Dresden facility resumed normal operations on December 9, 2025, approximately two weeks after the November 23, 2025 incident.

What type of damage did Greenidge Generation Holdings Inc. report from the Dresden facility incident?

Greenidge Generation Holdings Inc. reported limited damage to certain electrical switchgear at the Dresden facility due to the incident.

Is Greenidge Generation Holdings Inc.’s Dresden facility currently supplying power to the grid?

The company stated that the Dresden facility returned to service ahead of schedule and has resumed consistently delivering power to the local grid.

Who responded to the Greenidge Generation Holdings Inc. Dresden facility fire?

The company credited the prompt response of its employees, local firefighters, and utility partners with containing the incident and limiting damage.

Which securities of Greenidge Generation Holdings Inc. (GREE) are listed on Nasdaq?

Greenidge Generation Holdings Inc. lists its Class A common stock under the symbol GREE and its 8.50% Senior Notes due 2026 under the symbol GREEL on The Nasdaq Global Select Market.

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Accepted by SEC EDGAR 12/18/2025 - 04:08 PM Learn about SEC filing dates

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

___________________________________

FORM 8-K

___________________________________

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

December 18, 2025

Date of Report (date of earliest event reported)

___________________________________

Greenidge Generation Holdings Inc.

(Exact name of registrant as specified in its charter)

___________________________________

Delaware (State or other jurisdiction of incorporation or organization)			001-40808 (Commission File Number)			86-1746728 (I.R.S. Employer Identification Number)
1159 Pittsford-Victor Road, Suite 240 Pittsford, New York 14534
(Address of principal executive offices and zip code)
(315) 536-2359
(Registrant's telephone number, including area code)

___________________________________

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐			Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐			Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐			Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐			Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:
Title of each class			Trading Symbol			Name of each exchange on which registered
Class A common stock, par value $.0001			GREE			The Nasdaq Global Select Market
8.50% Senior Notes due 2026			GREEL			The Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 12b-2 of the Exchange Act.

Emerging growth company   ☒ 

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01 – Other Events.

As previously disclosed in its Current Report on Form 8-K filed on November 26, 2025, Greenidge Generation Holdings Inc. (the “Company”) reported that, on November 23, 2025, the Dresden, NY power generation facility (the “Facility”) owned by Greenidge Generation LLC, a wholly owned subsidiary of the Company, experienced an electrical switchgear failure and resulting fire (such event, the “Incident”), which was contained and resulted in the immediate and complete de-energization of the Facility pursuant to automated safety protocols.

On December 9, 2025, the Facility resumed normal operations, approximately two weeks after the Incident. The Incident did not result in any damage to the Company's owned or hosted Bitcoin miners located at the Facility and caused limited damage to certain electrical switchgear due to the prompt response of the Company's employees, local firefighters and utility partners. The Facility returned to service ahead of schedule and has resumed consistently delivering power to the local grid.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Greenidge Generation Holdings Inc.
By:			/s/ Jordan Kovler
Name:			Jordan Kovler
Title:			Chief Executive Officer

Date: December 18, 2025